/Engine/Source/Editor/ComponentVisualizers/Public/SplineComponentVisualizer.h
virtual bool HandleInputKey ( [FEditorViewportClient](API\Editor\UnrealEd\FEditorViewportClient) * ViewportClient, [FViewport](API\Runtime\Engine\FViewport) * Viewport, [FKey](API\Runtime\InputCore\FKey) Key, EInputEvent Event )